Telegraph-so under



(No Mod-$1.

D.M.DI ]NN. TELEGRAPH SOUNDER.

No. 568,527. Patented Sept. 29, 1896..

W/T/VESSES:

A TTOR/VEYS.

UNITED STATES DAVID M. DUNN, OF ABINGDON, VIRGINIA.

TELEGRAPH-SOUNDER.

SPECIFICATION forming part of Letters Patent No. 568,527, dated September 29, 1896. Application filed January 27,1896. Serial No. 576,967. (No model.)

To aZZ whom it WtCbZ/ concern:

Be it known that I, DAVID M. DUNN, of Abin gdon,in the county of WVashington and State of Virginia, have invented a new and useful Improvement in Sounders for TelegraphRelays, of which the following is a specification.

The object of my invention is to provide a sounder for a telegraph-relay which will dispense with the local battery and extra sounder-magnets at each station and enable the ordinary relay with its relatively feeble power to produce a loud and distinct sound without in any way impairing the efficiency and certain action of the relay-armature.

To this end it consists chiefly in connecting to the relay-armature a broad, flat, and thin plate held rigidly at one end and concaved or buckled in the center, so that when it is deflected by the slight power of the relay-armature it will emit the cry of a buckled sheet of metal, which in quickly changing its plane with a click will produce a sound-wave oflarge volume and intensity with the application of a very slight actuating force.

My present invention is in the nature of an attachment adapted to be placed upon any relay already in use, which I will now proceed to describe with reference to the drawings, in which- Figure 1 is a perspective view of a relay equipped with my sounder. Fig. 2 is an enlarged section, and Fig. 3 a face View, of the sounder; and Fig. 4, a side view of a modification.

In the drawings, A represents an ordinary relay, to whose armature or armature-lever B is attached a light rod or wire a, connecting with my sounder attachment. This attachment comprises a hollow box-like casing 0, having an offsetting arm 0' and attached right-angular stem 0 which latter slides through a hole in a post C and is rigidly fixed therein by a set-screw, so as to sustain the attachment directly in front of the relayarmature. The box 0 has near its outer edges grooves c 0, into which is slid and retained a thin sheet-metal plate I), of resilient quality, which forms a sort of diaphragm or head to the box. This plate I) has near its center a buckled or concave portion 0a, and is tightened and held in the grooves c of the box byasetscrew 6' and j am-nut,which set-screw is tapped through a bracket-arm f and bears against the thin plate with a greater or less tension. A second set-screw c with jam-nut is tapped through the end of bracket f directly over the concaved or buckled part of the plate. To stiffen the outer end of the plate where it connects with the wire a, it is wrought into a series of corrugations b. This compels the plate I) when deflected by the pull of the wire a to bend across the buckled portion 00 and shift the plane of this portion with a loud click, and prevents the bending of the plate at a point outside the buckled portion.

Now when the armature of the relay is worked by the alternate opening and closing of the circuit over the line the wire causes the slight and feeble motionof the armature to be transmitted to the plate I), which in moving back and forth causes its buckled portion at to quickly shift its plane laterally with a loud click. when the concave side of plate Z; is next to the set-screw e, and the wire a is pulled by the armature in the direction of the arrow, the plate 1) assumes the dotted position and compels the buckled portion 00 to shift laterally, and moving with a loud click outwardly toward and against the end of set-screw c with a hammering impact which may be made of greater or less amplitude of movement by adjusting the set-screw e. For this effect the sides of the box or case 0 act as a soundingchamber that augments the sound, causinga Very feeble application of power to the plate I) to make a very loud sound that dispenses with the necessity of sounder-magnets and a local battery and saves all this extra expense.

The set-screw e not only serves to tightly hold the plate I) in the box or case 0, but by adjusting the screw 6 so as to bend the plate I) more or less the buckled tension of the same may be increased or diminished to give a tone of varying intensity or pitch, as may be desired.

To the lower part of the box 0 there is an adjusting-barrel D, provided with a milled head, on which is wound a thread connected to a helical spring cl, whose other end is attached to the armature of the relay. This is merely for the purpose of adjusting the pull of the armature away from the relay-magnets, so as to adapt it in sensitiveness to the Thus, as seen in Fig. 2,

varying conditions of the current on the line as aifected by changes of the weather or variations in the battery-current.

As a modification of my invention I may mount the box or casing C so as to have the plate directly operated upon by the armaturelever, as shown in Fig. 4. In such case the casing C may be advantageously fixed to the framework of the relay directly above the armature-lever, or it may be attached in any other relation.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A combined relay and sounder, comprising a relay-magnet having attached to its armature a buckled plate held fixedly at one end and adapted to have its plane shifted with a click by the movement of the relayarmature, substantially as described.

An attachment to a relay comprising a box or casing having a resilient diaphragmplate buckled as described and adapted to shift its plane when deflected, and means for supporting and connecting it to the relay-armature substantially as shown and described.

3. A sounder for a relay, consisting of a frame holding a buckled plate, and an adjusting-screw for locking the plate in the frame and also varying the tension of the buckled plate substantially as shown and described.

i. A sounder for a relay, consisting of a frame holding a buckled plate and an adjustable set-screw arranged in front of the buckled portion of said plate for a hammering impact therewith substantially as and for the purpose described.

5. A sounder for a relay, consisting of a frame holding a buckled plate and two setscrews one for holding the plate in the frame with avarying tension and the other adjusted for a hammering contact with the buckled portion of the plate substantially as shown and described.

6. A sounder for a relay, consisting of a frame, a buckled resilient plate held in the same and having a stiffened portion between its free end and the buckled portion substantially as and for the purpose described.

7. The sounder attachment consisting of a frame holding a buckled plate and having a stem C in combination with aperforated post and set-screw for sustaining the same as set forth.

DAVID ill. DUNN.

lVitnesses:

EDW. U. BYRU, SoLoN C. KEMoN. 

